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When I tried to fix this before I didn't realize there was already a pattern for `-(a ptrdiff b) -> (b ptrdiff a)`, I had added a complex pattern to match `ptr0 - (ptr0 - ptr1)`. But with there being a pattern for `-(a ptrdiff b)`, we just need to extend the pattern to support a nop conversion inbetween the negative and the ptrdiff. Also the check for TYPE_OVERFLOW_UNDEFINED was wrong, in the case of `-(a - b) -> (b - a)`, the check is !TYPE_OVERFLOW_SANITIZED so this pattern should use the same check. Bootstrapped and tested on x86_64-linux-gnu. Changes since v1: * v2: Use the old type of the pointer_diff rather than ssizetype. PR tree-optimization/121921 gcc/ChangeLog: * match.pd (`-(a ptrdiff b)`): Extend for a nop_convert between the neg and ptrdiff. gcc/testsuite/ChangeLog: * gcc.dg/pr121921-1.c: New test. Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
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